Mike Chewbacca:A commercial plane uses the fuel whether or not Leo was on it. A private jet does not. But you knew this already.

Getting on a commercial jet also helps to make a flight more profitable, and therefore, more likely to continue.

Actors are immense hypocrites about the environment. I remember Emma Thompson complaining about a runway being built. If you looked down her news for the past 4 weeks on IMDB, she'd been hopping across the Atlantic regularly doing interviews, and award ceremonies. And Sienna Miller was regularly hopping around the world with boyfriends while a reprentative for an environmental charity group.